dellinger



A. M'. DELLINGER.

GRINDING DISK.

APPLICATION FlLED AFR-28,1920.

Patented May 9, 1922.

nlllnm A. M. DELLINGER.

GRINDING DISK.

APPLICATXON HLED APR-28.1920.

Patented May 9, 1922.,

2 SHEETS-SHEET 2.

Ina/622 6 7': d7 M1765 Zephyr??? WMQM ABRAHAM M, DELLING-ER, OF LANCASTER, PENNSYLVANIA.

GRINDING DISK.

Application filed April 28, 1920.

To all whom it may concern:

Be it known that ABRAHAM M. DELLINGER, a citizen of the United States, residing at Lancaster, in the county of Lancaster and State of Pennsylvania, has invented certain newand useful Improvements in Grinding Disks, of which the following is a specification.

In grinding mills there has been much difliculty in obtaining proper feed of the material to be ground. One of the most important considerations in obtaining the greatest elliciency in grinding mills is that of feeding the material to the grinding disks. One of the best and most successful in general use is that of the screw feed, as shown in my prior Patent 855,099. In all such feeds, however, there is nothing to feed the material from a point at the approximate end of the screw into the space between the grinding surfaces of the disks. For feeding from that point the miller must rely on gravity, or centrifugal action, or the drawing action of the grinding ribs or teeth themselves, or on two or all of them combined. On the other hand, if the screw feed is increased beyond a certain point the disks will become clo ged and the machine will not work.

l he present invention is particularly designed to overcome these and other objections and provide a grinding disk of simple, comp act, and inexpensive construction, and of greatly increased efliciency, by which the material. is automatically taken from the conveyor as it enters the disk-eye, and posi tively forced between the grinding surfaces of the disks, compelling the disks to work: at full capacity and highest eflicienc The construction is such that the feeding oper tion compels the material to move outwardly from the center toward the circumference, avoiding any possible tendency to pack or clog and at the same time completely avoiding any idle or non-Working periods during which material would not be passing between the grinding surfaces for lack of such a feeding means.

In order to more clearly, disclose the construction, operation, and use of the invention, reference should be had to the accompanying drawings. Throughout the several figures of the, drawings like reference characters designate the same parts.

In the drawings:

Specification of Letters Patent.

Patented May 9, 1922.

Serial No. 377,224.

Fig. 1 is a fragmentary vertical cross section through part of a mill, showing the disks applied.

Fig. 2 is a face or plan view of one of the disks.

Fig. 3 is a crosssection on line 3-3 of Fig. 2.

Fig. 4 is a plan view of the two disks, in operative relation at the instant that the pairs of feeding blades or ribs begin to cooperate, the stationary disk being shown in dotted lines superposed upon the stationary disk.

Fig. 5 is a like view just as they have completed co-operation, and

Fig. 6 is a similar view after the feeding blades of the rotary disk have passed beyond the operative position and are traveling toward their next operation position.

In illustrating the use of the invention it has been shown as applied to the vertical disk type of grinding mill, which is, preferably, the way it will be used.

The mounting of the disks is substantially the same as in my prior patent above re- :lerred to, and shown in Fig. 1, the stationary disk 1 being fixed to plate secured to the machine frame, while the traveling or rotary disk 2 is made fast to a head or plate suitably keyed to the revoluble shaft which carries and drives the feed screw and which passes through the eye of the stat'ioimry dirk. The eye or central opening of the order or rotary disk is completely closed, of course, by the head or plate to which it secured, as clearly shown, thus prim tinting escape of material except be tween the disks. The grinding surfaces of the disks may be as in my prior Patent 858,267 and either with or without the feed drifts therein disclosed, or the grinding surfaces may be entirely different. Whatever grinding surface may be used, each disk is provided with specially constructed feeding blades or ribs 3 and co-operating webs 4:. As shown in the drawings, each disk is provided with two such ribs and (Bo-operat- 111g webs, and, preferably, two of each, as shown, will be used. However, one rib and web or each may be used, though with less effect. Each rib extends in the direction of a cord of the disk-eye and for a distance about onehalf the length of the cord, having its free end at a d1stance of about one-third of the diameter of the eye from the nearest point of the eye circumference. Thus the two ribs are substantially parallel with one diameter of the disk-eye, disposed equidistantly at opposite sides there of, and extend in opposite directions relatively to each other, while their free ends lie in another diameter of the disk-eye substantially at right angles to thefirst mentioned diameter. Each blade or rib, it will be noticed, extends for substantially the full depth or thickness of the disk throughout the length of such blade or rib.

Though certain proportions and directions have been approximately stated, it is obvious that they are not absolute or arbitrary, but may be appreciably varied. From each blade or rib extends a co-operating web 4t,

covering the entire segment (substantially a quadrant) lying between the blade and the adjacent arc of the disk-eye. Web l is comparatively thin and lies flush with the back of the disk. If desired, it may be made to taper in thickness from its outer edge toward the angle formed by the junction of blade or rib 3 with the disk. This will give a slight incline from the outer or receiving end toward the inner or delivery end from which point the material finally passes be tween the grinding disks. From the above it will e seen that each disk has what may be termed one or. two, preferably two, substantially quadrant-shaped feed pockets the walls of which comprise rib 3, web l, and the adjoining are of the disk-eye.

In the grinding position the disks will be so arranged that there will be but a very small space between the two grinding faces,

as in Fig. 1, the exact final adjustments depending upon the gradeor fineness desired in the flour or other final product of the grinding. When in their operative or grinding position, the pocket-s and several elements thereof or each disk cooperate with the pockets and pocket elements of the other disk, so that by rotation of disk 2 its pocket elements co-operate with those of the stationary dlsk l to first form a double pocket of twice the area and depth 01" the individual pockets, then to gradually reduce the double pocket to the volume of the single pocket, and then to pass beyond the co-operative posltion through an inoperative area or sectlon, and on toward similar co-operatlve relation with the next set of pocket elements. This is clearly shown, in

the order given, in Figs. 4, 5, and 6, the stationary disk and its pocket forming elements being indicated in dotted lines and superposed for clearness.

Due to the fact that each rib 3 extends in the direction of a cord of the disk-eye, the rotation of disk 2, after reaching the position of Fig. 4, causes the ribs of disk 2 to gradually force most of the material from the double pockets outwardly between the grinding surfaces, as will be clear on reference to Fig. 5. The action is just as though the two walls of the double pock iormed by the ribs were closed together from the inner part of the eye toward the circumference, the ribs of the rotary disk having a sliding motion across and along, though not touching, the ribs of the stationary disk from their inner to their outer ends so that at the end of the pocket closing operation the outer ends of the ribs of the rotary disk are just passing beyond the outer ends of the ribs of the stationary disk. The webs 4:, of course, retain the material so that it may be engaged and red outwardly by the ribs.

Various changes may be made in the construction, arrangement, and disposition of the several parts of the invention within the scope of the appended claims, and it is meant to include all such within this :11 plication wherein only a preferred form has been disclosed by way of illustration.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. A grinding disk provided with a feed rib extending within the eye of said disk, and having a web extending from said rib to said disk, said web being disposed at that side of said rib which is toward the direction of rotation of said disk and terminating at rib extending within the'eye of said disk,

and having a web extending from the entire length of said web to theadjacent are of said eye, said web being disposed at that side of said'rib which is toward the direction of? rotation of said disk and terminating at the tip of said rib.

3. A grinding disk provided with a feed rib having a height approximately equal to the thickness of said disk and. extending within the eye of said disk, and a web extending from said rib to said disk, said web being disposed at that side of said rib which is toward the direction of rotation of said disk and terminating at the tip ot said rib.

4. A grinding disk provided with a feed rib extending within the eye of the disk in the direction of a cord of said eye and having a height approximately equal to the thickness of said disk,and a thin web extending from the entire length of the back of said eye in the direction of a cord of said eye, and a web connecting each rib with the adjacent are of its disk-eye, the rib and web of one disk being adapted to cooperate with the rib and Web of the other.

7. A grinding disk having a centrally disposed eye and provided with a triangular pocket extending inwardly from the circumference of said eye in the direction of a cord of said eye.

8. A grinding disk having a centrally disposed eye and provided with triangular pockets extending inwardly from the circumference of said eye in the direction of cords of said eye.

9. A grinding disk having a centrally disposed eye and provided with oppositely directed triangular pockets extending inwardly from the circumference of said eye as cords of said eye.

10. A grinding disk having a centrally disposed eye and rovided with a triangular pocket extending mwardly from the circumference of said eye in the direction of a cord of said eye, said pocket comprising a feed rib and a web extending from said rib to the adjacent arc of said eye.

11. A grinding disk having a centrally disposed eye and provided with a triangular pocket extending inwardly from the circumference of said eye in the direction of a cord of said eye, said pocket comprising a feed rib of a height approximately equal to the thickness of said disk and a web extending from the back of said rib to the back of the adjacent arc of said disk.

12. A grinding disk provided with a pocket extending within the eye thereof and having its retaining wall in a plane lower than that of the operative surface of said disk and having an inclined surface leading from said pocket to the operative surface of said disk.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

ABRAHAM M. DELLIN GER.

Witnesses:

Gno. W. HEUBER,

CHAs. R. DOEBLER. 

